Historical clue formulations

• 56-Across figure — 2005-02-21
• 5¢ or $2 — 2005-02-06
• A U.S. president who was also an architect, musician and inventor was … — 2004-12-05
• Author of this puzzle's quote — 2004-08-05
• Monticello flip side — 2002-12-10